I really do not know that anything has ever been more exciting than diagramming sentences.
— Gertrude Stein

Diagramming Sentences I
http://www.german-latin-english.com/diagrams.htm

Diagramming Sentences II
http://grammar.ccc.commnet.edu/GRAMMAR/diagrams/diagrams.htm

Diagramming Sentences III
http://wonder.k12.ar.us/hellmer/diagramming.htm

Sentence Diagramming
http://www.lifestreamcenter.net/DrB/Lessons/TS/diagram.htm

eTHEMES: Diagramming Sentences
http://www.emints.org/ethemes/resources/S00001595.shtml

Surfing the Net with Kids: Diagramming Sentences
http://www.surfnetkids.com/diagramming_sentences.htm

Paula's Archive: Diagramming Sentences
http://www.redshift.com/~bonajo/diagram.htm

Wikipedia: Sentence Diagram
http://en.wikipedia.org/wiki/Sentence_diagram